Spark
From Cths
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The spark of a Transformer is the source of its life and sentience. It is the third and most important of the basic parts needed to create a fully functional Cybertronian, the other two being their chassis and their programming. Without it, a bot would be considered no better than a drone.
Sparks cannot exist without some kind of housing. When affixed to a body, its usually located in a spark chamber, which in turn is usually located somewhere deep in the torso region. This casing is incredibly durable, and as was often seen during the Avok War, could sustain enormous amounts of damage while keeping the spark intact. (Of course, one would have to wonder just what a mech's body would look like at that point.) A spark doesn't have to remain inside the body of a Transformer to remain kindled, though. As seen in Spotlight: Arcee, sparks of criminals are extracted and placed in containment cells while imprisoned.
